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NST (NonStopTuning) 370Z VQ37HR Pulley Kit Review w/ Dyno Charts

Originally Posted by ssqpolo i have posted pics of my gtr and z here. anyway, i dont have to prove anything to u. ppl here know me. i enjoy the

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Old 08-27-2009, 05:09 PM   #31 (permalink)
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Originally Posted by ssqpolo View Post
i have posted pics of my gtr and z here. anyway, i dont have to prove anything to u. ppl here know me. i enjoy the information posted on these forums. anyway.
NST! send me a set and i will do before and afters!!
Word, same here!
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Old 08-27-2009, 05:11 PM   #32 (permalink)
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Guys, I appreciate the interest and the offers for dyno testing.

We have spent a great deal of time, resources, and money on developing the best possible kit for this application. We have conducted our own unbiased dyno testing at a neutral site with a street car. And there have been others who have posted dyno charts with a very similar crank pulley on a 370Z here on your own forums.

In addition, we are offering you the most complete kit in two different HARD ANODIZED colors, amazing customer service, and the LOWEST MSRP when compared to similar options.

Having said all of this, we are simply not in the position to be handing out free kits at this time.

Feel free to do your own searching through the links that have been provided by myself and others, and make your own decision. If you look with an open mind and read through what everyone else has written you will find that we do not fabricate numbers and do not need to. Our products are solid, our testing is legitimate, and the feedback from our customers speaks volumes.

Thanks again, good luck and have fun with all your projects!
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Old 08-27-2009, 05:11 PM   #33 (permalink)
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Originally Posted by ssqpolo View Post
i have posted pics of my gtr and z here. anyway, i dont have to prove anything to u. ppl here know me. i enjoy the information posted on these forums. anyway.
NST! send me a set and i will do before and afters!!
Was I right? LOL (Couldn't resist)
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Old 08-27-2009, 08:09 PM   #34 (permalink)
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OK, I pulled the trigger on the full set. This will be my first mod for the car since I've only had it a month tomorrow...

I hope I can find someone to install these since I wouldn't trust myself to wrench on the car. If anyone knows of a reputable shop in San Antonio, TX for something like this, please let me know.

Thanks,

Tony
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Old 08-27-2009, 11:29 PM   #35 (permalink)
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According to Stillen's website, they're undrive pulley is 20% vs NST's 10%. Weights seem to be identical. When referring to the underdrive %, wouldn't a greater % yield better performance. Or am I misunderstanding something?
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Old 08-28-2009, 08:09 AM   #36 (permalink)
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OK, I pulled the trigger on the full set. This will be my first mod for the car since I've only had it a month tomorrow...
Awesome. Not sure it would be financially feasible to ask for a dyno before and after but I'm sure everyone would appreciate it if you did. If not, some overall feelings on it would be nice.
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Old 08-28-2009, 08:41 AM   #37 (permalink)
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CBRich,

First have to find someone to do the install, but I'll be sure to check back with my impressions. Don't think I can justify spending the extra money for dyno time for just this mod though.
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Old 08-28-2009, 09:57 AM   #38 (permalink)
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Originally Posted by ZforMe View Post
According to Stillen's website, they're undrive pulley is 20% vs NST's 10%. Weights seem to be identical. When referring to the underdrive %, wouldn't a greater % yield better performance. Or am I misunderstanding something?
Now you have me curious.... Are they the same size and it's just how they are stated in percentage or is the Stillen really smaller? Yes, on paper a 20% underdrive should produce slightly more power.
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Old 08-28-2009, 09:59 AM   #39 (permalink)
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Originally Posted by tcarretti View Post
OK, I pulled the trigger on the full set. This will be my first mod for the car since I've only had it a month tomorrow...

Tony

Thank you for your interest in our site and the order Tony, we certainly do appreciate it.

Your package is scheduled to ship out later today, via USPS Priority Mail with Delivery Confirmation, and should reach you within the next day or two. Please keep an eye on your Email account over the next few hours.

Feel free to give us a call and stop by our Houston showroom if you're ever in the area. We love meeting our customers and would be happy to chat with you in person!

Thanks again, good luck and have fun with all your projects!

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Old 08-28-2009, 10:42 AM   #40 (permalink)
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Hi everyone!
You know, it's not much of a review if the vendor is the one doing the review.
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Old 08-28-2009, 11:23 AM   #41 (permalink)
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Originally Posted by Denny McLain View Post
Now you have me curious.... Are they the same size and it's just how they are stated in percentage or is the Stillen really smaller? Yes, on paper a 20% underdrive should produce slightly more power.
I'm curious too. With the Stillen pulley, you need a new (shorter) belt. You don't need a new belt with NST. That makes me wonder if it's really underdriven. Looking at the original post, NST wrote "The NST Kit includes a 10% Underdrive Crank Pulley along with a 10% Overdrive (faster) Alternator Pulley. This means that the alternator will run at OEM speeds when the NST kit is used." I guess that's why they still use the OEM belt. But if the alternator is running at OEM speeds, doesn't that kinda cancel out the effect of the underdrive crank pulley? I'm by no means an expert on this stuff, so I'm just asking the question.
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Old 08-28-2009, 11:42 AM   #42 (permalink)
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I'm curious too. With the Stillen pulley, you need a new (shorter) belt. You don't need a new belt with NST. That makes me wonder if it's really underdriven. Looking at the original post, NST wrote "The NST Kit includes a 10% Underdrive Crank Pulley along with a 10% Overdrive (faster) Alternator Pulley. This means that the alternator will run at OEM speeds when the NST kit is used." I guess that's why they still use the OEM belt. But if the alternator is running at OEM speeds, doesn't that kinda cancel out the effect of the underdrive crank pulley? I'm by no means an expert on this stuff, so I'm just asking the question.
Alternator doesn't "soak" much in the way of power from the engine.

The power steering pump, water pump, and A/C do.

The idler pulley might be more towards it's upper range of extension with a 10% underdrive and the OEM belt. Is Stillen's underdrive 10% also, or is it higher?

Also, the alternator pulley would be smaller to run at OEM speeds - which would increase the need for a shorter belt even more - like I said, I suspect the idler pulley for belt tension is just more at it's upper range of tolerance...
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Old 08-28-2009, 12:33 PM   #43 (permalink)
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OK, now you guys have me worried... Well, I guess if it works out well I'll consider myself lucky and if it doesn't then it's a lesson learned to do more research and let someone else be the guinea pig...
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Old 08-28-2009, 12:51 PM   #44 (permalink)
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I wouldn't worry about it, Tony. We're just asking questions, not saying that something is wrong or doesn't add up. You won't know if you really get gains without a before/after dyno though. It's hard to feel such a relatively small gain (relative to the total hp of this car, that is).
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Old 08-28-2009, 04:32 PM   #45 (permalink)
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The NST Underdrive Crank Pulley is a 10% underdrive (slow down) pulley, and as you can see in the pic here, it is very close to the OEM pulley in size. This pulley is designed to slow the accessories by roughly 10%... not enough to "kill" any of the accessories, but just enough to free up a nice amount of hp and tq to send to the wheels. The excellent weight reduction also aids in providing better throttle response, quick acceleration, and better fuel economy. We did a bit of testing and decided that 10% is the sweet spot for this application. 20% or 30% underdrive may provide an extra 1/2 or 1 hp or tq at the wheels... but it may do so at the expense of some of the other accessories' functions, so we decided to stick to 10% for our pulley.




The NST Overdrive Alternator Pulley is a 10% overdrive (speed up) pulley, and as you can see in this pic, it is also very similar in size, to the OEM pulley. This pulley is designed to bring the alternator back to OEM speeds. No slower, no faster. There will be NO hp or tq loss when using this pulley. The crank pulley is the SENDER pulley and it is the pulley that decides how much power the accessories will receive. The size of each accessory pulley determines how this power is used. The alternator will not be overworked, underworked, robbed, killed, etc. when the NST pulley is used. It will work in the same efficiency range as it would with the OEM Nissan pulley.




NST Pulleys are NOT a "one size fits all" type of design. We take the needs of each application into consideration, we come up with a few prototypes/configurations, and ultimately we sell the KIT that works best based on the data we collect.

Both pulleys are compatible with the OEM belt and the OEM belt has shown to work very well during the past several months of testing. As long as you are using a new belt, or your current belt is in good condition, you should be good to go!

There are other options out there, and some of them are excellent options. We feel that NST offers the best all around kit, with the best all around options, at the best possible prices. Our customers feedback and reviews have consistently proved these to be the truth.

Thanks again everyone, good luck and have fun with all your projects!
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